Earth has only one natural satellite, the moon, which is relatively large compared to its parent planet. It orbits Earth at an average distance of about 384,400 kilometers and completes one revolution approximately every 27.3 days. The moon is thought to have formed about 4.5 billion years ago, likely resulting from a massive collision between Earth and a Mars-sized object called Theia. Although Earth only has one true satellite, several small, temporary natural satellites occasionally enter Earth’s orbit for short periods.
The moon is a constant source of minimoons
